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A consolidated-undrained (CU) test on normally consolidated clay yielded the following results: Principle pressure:                  σ1 =...

A consolidated-undrained (CU) test on normally consolidated clay yielded the following results:

Principle pressure:                  σ1 = 6150 psf

Deviator stress at failure:        (Δσd)f = 3600 psf

Pore pressure at failure:          (Δud)f = 1150 psf

Based on the given information and your soil mechanics knowledge, determine the drained and undrained friction angles (i.e., φʹ and φ)

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